A communication disorder is a disease or condition that partially or totally prevents human communication. The defect can be in producing, receiving or understanding the communication.
Examples of communication disorders:
autism -- a developmental defect that affects understanding of emotional communication
aphasia -- loss of the ability to produce or comprehend language
... of the town is 98.03% White, 0.59% African American, 0.00% Native American, 0.52% Asian, 0.13% Pacific Islander, 0.26% from other races, and 0.46% from two or mo ...